// JavaScript Document

function expand_nav(link){
	var ul = find_enclosing_ul(link)
	if (ul.style.display == 'none'){
		ul.style.display = 'block'
	} else {
		ul.style.display = 'none'
	}
	if (link.className == 'close'){
		link.className='open'
	} else {
		link.className='close'
	}
}
		
function find_enclosing_ul(link){
	var search_node = link
	while (true){
		var node = search_node.nextSibling
		if (node && node.nodeName == 'UL'){
			break
		} else {
			search_node = node
		}
	}
	return node	
}